结构转化的SQL语句为：
create or replace view
v_sale(year,month1,month2,month3,month4,month5,month6,
month7,month8,month9,month10,month11,month12)
as
select
substrb(month,1,4),
sum(decode(substrb(month,5,2),'01',sell,0)),
sum(decode(substrb(month,5,2),'02',sell,0)),
sum(decode(substrb(month,5,2),'03',sell,0)),
sum(decode(substrb(month,5,2),'04',sell,0)),
sum(decode(substrb(month,5,2),'05',sell,0)),
sum(decode(substrb(month,5,2),'06',sell,0)),
sum(decode(substrb(month,5,2),'07',sell,0)),
sum(decode(substrb(month,5,2),'08',sell,0)),
sum(decode(substrb(month,5,2),'09',sell,0)),
sum(decode(substrb(month,5,2),'10',sell,0)),
sum(decode(substrb(month,5,2),'11',sell,0)),
sum(decode(substrb(month,5,2),'12',sell,0))
from sale
group by
substrb(month,1,4);
更多Oracle相关信息见Oracle 专题页面 ?tid=12
